This is an irony using the popular meme of mixing Mentos into a bottle of soda. There was a period of time in 2007 when a large number of videos depicting this phenomenon floated around the Internet.

Cueball wants to show an incredible phenomenon to his friend, because it's "the coolest thing", but it turns out instead of fizzling Diet Coke everywhere, the friend's father magically shows up (presumably from the dead or from abandonment).

The title text shows that Randall considers (or at least then considered) this trick to be one of the two coolest tricks you can perform with normal kitchen supplies. The other is using corn starch and water to make a non-Newtonian fluid that reacts wildly with vibrations and impact.

Discussion

The title-text reads badly, for me, but indicates that the (traditional) trick as depicted is cool, to the author, along with the non-Newtonian Liquid demonstration. (Although that latter may also have been done to death by virtually every science-for-kids-or-fun TV show that go in for that kind of thing...) 178.98.31.27 03:46, 19 June 2013 (UTC)

I don't think the "Ta-daa" pose meant that Cueball was expecting his friend's dad to appear out of nowhere instead of the Diet Coke + Mentos eruption. 108.162.216.45 22:49, 18 December 2013 (UTC)

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